these 4 derivations will be built:
  /nix/store/fplfy1whcvlnn5wfdgm72dmcvbr0ch6l-nix-config.json.drv
  /nix/store/drln5jn6xskj4h1vk3pygyvsipvd39xj-docker-layer-nix.drv
  /nix/store/27lsvc7dgg8jrm1hv9m6hj3ldcaz7ai7-runtime-deps.drv
  /nix/store/wik0dkc0p0xjpp29pkb477kg9f6qdxfm-docker-image-nix.tar.gz.drv
these 7 paths will be fetched (1.2 MiB download, 3.5 MiB unpacked):
  /nix/store/qjqb5ax3alsikimwrvlh5qkks9499gfn-jshon-20170302
  /nix/store/9ldp0p9rz74338nigpg0lvlr3hm022yw-moreutils-0.70
  /nix/store/kwgcifgj2ap43mbjvbb41bkwd0rv2yg7-perl-5.42.0-env
  /nix/store/kyph9zd1a020dxf7hrgpnp0zlmn4dswq-perl5.42.0-IO-Tty-1.20
  /nix/store/vg703xqd8flpdqfz427dyfa3a17hdyrk-perl5.42.0-IPC-Run-20231003.0
  /nix/store/qjn3kpq08yglxcp44m85183iq06316b2-perl5.42.0-Time-Duration-1.21
  /nix/store/9kg43695ziz029vdw0gppw3fsmv3srbr-tarsum
docker-layer-nix> Adding contents...
docker-layer-nix> Adding /nix/store/ln8hsnpnsj84nysyadwdn29jpdjiggzx-base-system
docker-layer-nix> Packing layer...
docker-layer-nix> Finished building layer 'nix'
runtime-deps> structuredAttrs is enabled
docker-image-nix.tar.gz> Adding layer...
docker-image-nix.tar.gz> tar: Removing leading `/' from member names
docker-image-nix.tar.gz> Adding meta...
docker-image-nix.tar.gz> Cooking the image...
docker-image-nix.tar.gz> Finished.